、。
To tell the truth, she no longer loves him.
Literal
True [possessive-の] thing [object-を] say [conditional-と], she [topic-は] already he [object-を] loving not [explanatory-のだ].
もう~ていない ('no longer doing X') marks the end of a state that once held. 愛していない is the negative of 愛している ('loves'). のだ adds explanatory weight — presenting this as a hidden truth being revealed.